Blowpipe.



J. HARRIS. BLOWPIPE. APPLIQATION FILED SEPT. 29,- 1909.

Patented Nov. 19, 1912.

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JHN HRRS, 0F CLEVELAND, OHM), ASSIGNR TO THE METALS WELXHNG Ctfl'vfl-iil",l

' 0F CLEVELAND, HXO, A ORFGRTN Clif l nnowrrrn.

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Specicaton o' Letters lPatent.

Applicatoniled September 2.9, 1909. Seriatro. mitteilt.

for burning 4oxygen and acetylene.

Among the object-s of the invention are the provision of a blow-pipe which shall be reliable in operation and in which the tip will not melt or oxidize the orifice and thus produce stoppage or distortion of the flame; also the provision of a blow-pipe wherein the proper mixing of the gases will be effected and in which the danger of lealtage both internally between the passages and externally to the exterior 4of the blow-pipe shall be a minimum; the provision of a device of this nature `wherein the tip may be quickly changed to adapt the parts recited in the claims hereto annexed and illustrated in the accompanying 'drawings, wherein:

Figure l represents a longitudinal sectional view taken through a blow-pipefand its handle; Fig. 2 is a sectional view 'corre-- y.spending to line QWQ of Fig. t; Fig. 3 is a sectional view corresliionding to line 3 3 of Fig. l; and Fig. 4 ris a side elevation of one of the tubes which is located in the acetylene conduit and which serves to prevent the propagation of llame therethrough.

Describing the parts by reference characters, l denotes the body or head section ofthe blow-pipe proper, said section consisting of a hollow casting of suitable metal,-

preferably brass. This casting has' a closed rear end 2 and an'open frontend 3, and is formed intermediate of its ends with an inwardly projecting annular portionl, here shown as provided with internal screw threads.

rllhe side ofthe section l is provided with a neck 6, saidneck being prorided with two passageways 7 and 8v communicating wi-th' the interior at opposite ends of theannulai' portion. 5. The outer end of the neel; G is provided with an annular groove having therein a packing 0, of asbestos or similar material. This groove is for the recept-ion 'of the end of acasing through which acetylene is supplied to the passageway 8.

The nozzle 10 is provided with a longif tudinal bore l1 for the passage of the mixed Y gases and is connected'to the section 1. rlhis nozzle is preferably of brass,.e:\cept us to the tip thereof, and comprises a tubular bodywvhose rearward end is adapted to enter the section l and whose forward end projects forwardly from said section 'to convey the mixed gases to the point of use. kThe rearward end of saidr nozzle indi-- cated generally by the ref-t encJ character l2 and has an annular portieri 123 adapted to engage the annular portion of the -section l. The portion of the casing and of the nozzle immediately fnrward of 'these annular portions are formed so as to deline an annular chember? which chan'iber is in communication with the passageway 8. The formation of the easing and or the nozzle at the rear of the annular portion is such as to provide 'a chamber l-l which is in free communication with the 'passageway 7. ln the embodiment illustrated, the chamber l has been provided by vforming an annular exterior groove in the-portion 1Q ofthe nozzle between the annular engaging portion and the end the section l; itis olwious,.liowevei". thatY this chamber could be provided in other vl ys. Likewise,

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forward end of the extension l2 adapted to-l engage the forward end of and vto close the chamber it isobvious `that this closurecould be effected otherwise,

The nozzle extension l); is formed with an axial recess 16, forming a continuetionof the bore l1, and the wall of this lrecess -is formed with ports 17 whereby sanieis :he section l 55 striking back therethrough.. The innermost of thesetubes may be connected with the;4

communication lbx'etween1the ports 17 `and In the present embodiment the rearward eiidlofffthe .recess 16 is shown as enlarged. V s4)inevvhat andprovided with internal screw adapted for 'engagement with stituting an` extensionbf the bore 11, and

similar screw-threads formed upon aneny ;lga'rgedv part ofzthe second .nozzle 20. Forffjv'rd Voffthis enlarged'portion the 4nozzle 201v .gqlf sillustrated' as reduced in size suiliciently tocause .it to fit slidably Within the main part oithe recess so as to insure the proper positioning va'ndfcenteringjof 'its discharge end irrespective of its`ad]ustment along the ":"I he"front1or'ma in portion of the nozzle projects fowar'dly from the section 1 .ind V x.si'he're shown as provided at its 'extremity fitted a ltip -24e,said" tip having a bore 25 conf.

#with afru'sto-'conical recessf23, in which -is Aalso having a" flange 26 adapted -to abut',

@ga-inst the front end-"ofthe nozzlel- This tip inaybe' of nickel desired which lis lfound-to exhibit peculiar advantages `in con- 'nection with blow` pipes of this character,

'although' any desired mateliial maybe e'1n'-.- ployed'within the'lscope' of my lpresent invention." A. washer 27 maypifkdesired-7 be Ml lvlfrposed between the iiange-15 and 1the front end ofthe section- 1*. l For -.conveying the gases. to vthe proper chambers of the casing I may 'employ' thel .construction illustrated in thel lower art of Fig. 1, wherein I have `shown a tubu ar cas.-V

having-one end introduced into the annular groovehereinbefore mentioned and havin its other end closed by a suitable cap 31. troduced within this casing I have illustrated a plurality of concentric metallic tubes 32 the peripheries -whereo are 'formed with .shallow helical grooves. 33,

.whereby acetylene or other intlammablegas may beconducted from one end .of the casing to the otherwithout-'the possibility of flame passageway 7 by means of a suitable conne/c'- tion 34 threaded therein, and the .opposite vend'thereof may be provided with aconnection 35 "extending through-an aperture in the --cap 31.` '-In the present embodiment the connections 34 and 35 are secured rigidly to the ends of thelsame tube 32, and the casing -30 secured in connection with the section 1- {by means of .a-'nut 37 screwed upon the threaded 'end 36 of the connection 35, suitable packing glands being employed to prevent the leakage of gas A valved nipple 38 maybe employed to conduct oxygen or like gas to the connection'35, while va similar nipple 39 maybe empioyed for conducting acet-yleneor like combustible fluid to the intrated here as provided with a socketA for the reception of such nipple. I have .shown filled with fibrous material A40, such 'as asbespropagation' of a dame therethrough in case be .forced back' into the' oxygen conduit, and .partly to cause the oxygen to pass .in 'close 'heat therefrom and cool the acetylene. vIt `will -be understood, vhoweverthat the p'a r` ticular construction of the chamber 30 and its associated parts form nopai't of the pres# entinventiom which is directed solely tov the construction ofthe blow .pipe head. 'Likewiseit will b e understood thatwhile I. have de-v scribed in detail the vconstruction 'ofthis head, I do not propose to be limited to such details, except as the same may he positivelyv lincluded iny the claims-hereto annexed or of the. art.. v

Having thus.. described my invention, whatV Iclaim'is: v .1. VIn al blow pipe, 'the combination of a` section 'having 1a' bore, said lbore being threaded intermediate lof its endsand said section having-inlet ports communicating with said bore gon. opposite sides ovs1 1ch threaded portion, ay nozzle having a ch'amber and hav' be threaded into 'the corresponding portion of the section bore, said nozzle being pro-- vided with a jet passage extending .fore wardly rom 4said chamber, and a second. nozzle threaded into the rear portion 'of the first lnozzle and. having a'tapered end co-' operating with said jet passage, said second nozzle being provided with'a bore communi- .'cating withthe spacel at the rear of the thread in the section bore, and one ormore tion with the section bore in fronti of Such. thread. l

section havinga longitudinal bore andpr'ovidedintermediateof the front and .rear of saidbore withanv inwardly project-ing threaded portion and having inlet ports communicating -with Vsaid bore"at opposite ing intermediate.. 'ofits endsa iian'ge andV provided with a chambered` extension atv the rear of'said ange, said extension being' pro-: vided with ports communicating-with ,said

2. In a blow pipe, thev combination of al terior ofthe casing 30, the cap 31 being' 'illusy the interior 'of thel innermosttube 32 as tos, partly for the purpose of preventing the l a mixture of acetylene should for any reason .80 .Y

lcontact with the tube 32 so asl to abstract may berendered necessary bythe prior state roo . 105 a threaded portion adapted to ports placing said chamber incOmmuniCa-v isc 1245 ends of such threaded portion, ya nozzle havL `the firstnozzle and having its front portion extending into said chamber in the rearwardly project-ing portion of said first nozzle.

3. In a blow pipe, the combination of a section having a longitudinal bore and provided intermediate of the front and rear of -said bore with an inwardly projecting threaded portion and having inlet ports communicating with said bore at opposite ends of suh threaded portion, a nozzle having a rearwardly extending threaded portion adapted to engage the threaded portion of said section, said rearwardly extending portion being hollow so as to form a chamber, the wall of said chamber being provided with ports communicating with the section bore in front of said threaded portion and said nozzle havinga jet passage extending forwardly from said chamber, and a second nozzle secured in the rearward end of said chamber and having a bore communicating at its rear end with the portion of said section bore at the rear of said inwardly projecting threaded portion.

4. In a blow-pipe, the combination of a section having a longitudinal bore and an inwardly projecting threaded portion intermediate of the ends of said bore, said section being provided with an inlet port communieating with said bore at opposite sides of said'threaded portion, a nozzle having a threaded portion adapted to engage said irst `threaded portion, the adjacent surfaces of said section and of said nozzle being so formed at a point forward of said threaded portion as to provide an annular chamber therebetween, means for closingrthe forward end of such chamber. said nozzle having a longitudinal bore and a recess with which said bore communicates, the wall of said recess being formed'with lateral ports which communicate with said annular chamber` and a second nozzle mounted in the rearward end of said recess and having a longitudinal bore therethrough substantially in alinement with the bore in said first nozzle and communicating with the chamber at the rear of said threaded portion, the forward end of said second nozzle being spaced from the bottom of said recess.

5. In a blow-pipe, the combination of a hollow section having aninwardly projecting annular portion intermediate of its ends, a nozzle having an annular portion adapted to engage said first annular portion, the adjacent'surfaces of said section and of said nozzle being so formed at opposite sides of said annular engaging portions as to provide a pair of separated chambers and the wall of said section being formed with an inlet port communicating with each of said chambers, said nozzle having a longitudinal bore and a recess with which said bore communicates, the wall of said recess being formed with lateral ports which communicate with the forward one of said chambers, and a second longitudinally bored nozzle mounted in the rearward end of said recess and communieating with the chamber at the rear of said threaded portion, the forward end of `said second nozzle being spaced from the bottom of said recess.

G. In a blow-pipe. the combination of a hollow section having a pair of inlet ports at longitudinally spaced points thereof, a tubular nozzle having its rearward end adapted to enter said section and its forward end to project therebeyond. the portions of said nozzle. and of said section lying between said inlet ports being formed for interengagement whereby communication between the ends of said section is prevented, and the adjacent walls of said section and nozzle being formed at each side of said interengaging portions to provide chambers. one of which is in communication with each of said inlet ports, the rearward portion of the bore of said nozzle being enlarged to form a recess and the wall of said nozzle having ports whereby said recess is put into communication with one of said chambers, and a second nozzle secured in said recess at the opposite side of said ports from the bore of said tirs-t nozzle, said second nozzle also having a bore substantially alined with the bore in said First nozzle and communicating with the other of said chambers.

In testimony whereof, I hereunto atlix my signature in the presence of two witnesses.

JOHN HARRIS.

"itnessest I J. B. Henn. BREXNAX B. lVisT. 

